Oscar Gobern has returned to Queens Park Rangers after suffering a cruciate knee ligament injury in training.
The 24-year-old midfielder made five appearances on loan for Doncaster but failed to feature on a winning side during his time at the Keepmoat Stadium.
His loan was due to run until January 4 but he has now returned to his parent club for treatment.
Rovers boss Darren Ferguson revealed the extent of Gobern’s injury following Saturday’s win over Colchester.
“Gobern, unfortunately, has done his cruciate,” he said.
“He’s had an horrendous injury in training on Thursday.
“There was no opposition or anything, we were just doing a bit of movement and shape work. He’s controlled the ball and the crack was horrendous really.
“He’s had his scan, he’s done his cruciate, so I feel for the boy.
“I’ve spoken to him since and obviously he’s a bit down but hopefully he’ll come back from it.”
Ferguson added: “Rob Jones suffered concussion on Thursday as well.
“So we had a right day of it on Thursday.
“Rob probably won’t start with us again in training until later this week so it was a bit of a poor day on Thursday.”
On-loan striker Keshi Anderson will be fit for Saturday’s FA Cup first round tie at home to Stalybridge Celtic.